Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd5b8889353e2116396c613e80eacdcc07791b32942cbb8ebda795f586938db' 
  AND token = 'emfjAuTE7y6uq4nBpiIFev90fypS+0SgyTMjEYNjLIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}